It is extremly important to regularly back up the content of your WP site so that for whatever reason might cause your data to be lost e.g. in the event of server failure
To do this, go to Tools on the sidebar menu and select ‘Exportâ€™
Chose All Content
You shoudl Save the file (.xml) somewhere that you can retrive easily if needed e.g. on your local C: drive ofÂ your PC/Tablet etc or on a USB stick.